20,4,238
#
in steps
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000000
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0000ff
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00007f
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007f00
007f7f 007f7f
007f7f
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0f03f2
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1404ee
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2307e1 2307e1
2307e1
ffff00 ffff00
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ffff7f ffff7f
ffff7f
ffffff ffffff
ffffff
2908dd 2908dd
2908dd